Patterns of herbaceous plant diversity in southeastern Louisiana pine savannas

摘要: Abstract Question: How diverse are Louisiana pine savanna plant communities and how is diversity affected by time since burn removal of a competitively dominant species? Location: Lake Ramsay, southeastern Louisiana, USA. Methods: Species-area curves were constructed from nine nested quadrats in open differing (6, 18 30 months). Species frequency was determined for 100 1-m2 quadrats. The grass, Andropogon virginicus, removed with herbicide moist dry sites to test possible effects competition. Results: Slopes log-log species-area relationships steep (0.195 0.379). Time did not affect the richness herbaceous plants, only woody species. More than half all species recorded (43/79, 54 %) infrequent (in < 10 % quadrats). After two years, there no differences composition plots without A. virginicus. Conclusions: high typical other savannas acros...